books.google.co.uk - Magnetism is one of the oldest and most fundamental problems of Solid State Physics although not being fully understood up to now. On the other hand it is one of the hottest topics of current research. Practically all branches of modern technological developments are based on ferromagnetism, especially...http://books.google.co.uk/books/about/Quantum_Theory_of_Magnetism.html?id=vrcHC9XoHbsC&utm_source=gb-gplus-shareQuantum Theory of Magnetism